Tubular exercise device



FIG. 1 is a top, front, and right side perspective view of an ornamental design for a tubular exercise device;

FIG. 2 is a top, rear, and left side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view and a mirror image of the right side elevational view thereof; and,

FIG. 6 is a top plan view thereof.

The broken lines of the tubular exercise device shown in the drawings are for illustrative purposes only and form no part of the claimed design. 

CLAIM I claim the ornamental design for a tubular exercise device, as shown and described. 